Fans assessment numeration system (FANS) was taking for testing the ventilation for each fan at the range of static pressures from 5.0Pa to 61.5Pa under different operating conditions. The results suggested that the existence and cleanliness of the fan safety guard reduced ventilation by less than 5%. The ventilation and efficiency of fans fitted with plastic shutters were 13.1% and 15.1% higher than the fans with aluminum shutters. The most difference of fans efficiency with same parameters reached to 12.7%. The average ventilation was reduced by 38.7% when the rotational speed drove by belt reduced by 16.1%. The energy consumption significantly increased when static pressure was more than 30Pa.